Bump flake8-docstrings from 1.4.0 to 1.5.0 in /{{cookiecutter.app_name}}

Bumps [flake8-docstrings](https://gitlab.com/pycqa/flake8-docstrings) from 1.4.0 to 1.5.0.
- [Release notes](https://gitlab.com/pycqa/flake8-docstrings/tags)
- [Changelog](https://gitlab.com/pycqa/flake8-docstrings/blob/master/HISTORY.rst)
- [Commits](https://gitlab.com/pycqa/flake8-docstrings/compare/1.4.0...1.5.0

)

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